Multispindle turret lathe



June 1l, 1929. F. PoPPENsl-EKl-:R

-MULTISPINDLE TURRET LATHE Filed Jan. 1s. 1927 4 sheets-sheet 'i June 1l, '1929. F PQPPENslEkER 1,716,532

MULTISP'INDLE TURRT LATHE 4 Sheets-Sheet 2 Filed Jan. 15,;1927

TTORWCYS.

June 11,- 1929.

F. POPPE/NSI'EKER MULTISPINDLE TURRET LATHE Filed Jgn. 13. 1927 4 sheets-sheet' s Julie 11, l929 F. PoPPENslEKER/ A1,716,532

MULTISPINDL TURRET LATHE Filed Jan-...13,1927 A 4 sheets-sheet 4 Patented June 11, 1929.

UNITED STATES PATENT oFFlcE.

v FRITZ POPPENSIEKER, OF COLOGNE, GERMANY, ASSIGNOR T O ALFRED H. SCHTTE,

OF COLOGNE-DEUTZ, GERMANY, A COMPANY OF GERMANY.

MULTISPINDLE TURRETy LATHE.

Application filed January 13, 1927, Serial No. 160,854, and in Germany December 11, 1925.

This invention concerns i1n} )rovements in or relating to multispindle turret-lathes of the* type provided with la stationary workholder, a main tool-slide which is .driven by a 5 spindle axially of the work, thatis of the length or har of material to be operated upon, and lateral slides moved transversely to the lengt-l1 ofthe material. Vith. such lathes diiculties are frequently encountered due to'tipping of the tool-slide resultant on the react-ion pressure on the tools. This has la detrimental effect-not only on the whole machine and driving means thereof but also,

and above all, on the tools and work. 15 In the machine according to the present invention, one object of ,which is to obviate the disadvantages mentioned., firstly the cutting pressure of all the tools is taken up by the threaded spindle of the tool slide in which the vformer is arranged axially and in the middle, and secondly the pressure at the end of themovement of the tool slide is'taken up by a stop lmounted on the threaded spindle. In consequence all pressures exerted on the movable tool-slide are taken up centrally and tipping Aof the main Atool-slide is avoid-ed.I

' Due to the uniform and exact feed movement the cutting points or edges remain in their prescribed positionsielatively to the Work vand wear out less rapidly than-Was hitherto the case. As a result less time, is lost in replacing and readjusting the tools and fewer tools arepusedup.

The invention is illustrated by way of example in the accompanying drawings in which Fig. 1 is a longitudinal section of one em bodiment of the invention, Fig. 2 a cross-section onthe line II-II in F'g. 3 a detail view on ,a,larger scale of a portion of the machine as shown in Fig. 2,

Fig. tis a sectional elevation to a larger scale of the means at the left handend of Figure 1 for holding and guiding the work.

' Fig. 5 a fr nt elevation thereof, Fig. 6 is a Vdiagrammatic View of the arrangement of a number of lathes relatively to the transmission shaft and v Figs."7 and 8 aresectional views at\ right anglesto each other of driving meansfor a lat e.

VFigure 9 is a sectional elevation corresponding to Figure 4 but showing the means at the right hand end of Figure 1 for holding and guiding the work.

Referring to Figs. 1-3 of the drawings the tubular th readedspmdle a on which 1s mounted an lntcrnally threaded member or sleeveY I) moves, on beingrotated, the main tool slide o in an axial direction and is driven itself in known manner by a change-speed clutch l in such a'nlanner that the tool slide performs a slow forward movement and a rapid back-V ward movement. The spindle a 1s kdisposed in the main tool slide precisely at the centre of the tool circle and takes up therefore the remeton-pressures of all the tools mounted on the 'slide' c so that tipping or tilting thereof is impossible. The threaded spindle derives rotation from the pulley e which drives through bevel wheels f, a shaft g and suitable pinions, the double clutch member (l of the change speed gear which is splined to'the threaded spindle a, 'whereby the latter is driven in one or the other direction depending on whether the clutch is engaged to the left or right. `As the tool slide "c in its slow forward movement approaches its forward end-position a central boss 71. provided therevon comes into contact witlha stop z' which is arranged co-axially with the threaded spindle, the slide being thus brought to. an immediate standstill. In contradistinction tovpreviously known multi-spindle automatic lathes in which the tool slides were liable to tlp at the termination of the-movement on account ofthe lateral position of the stop, thus causing thetermination of the movement of the various tools mounted i irregular, in the mach ne according to the .present invention the central arrangementof the tool slide to be\ m the stop is of substantial importance since, due

to the pressure being wholly taken up centrally, no tipping or tilting can occur and the movements of allthe. tools terminate in an exactly uniform manner. By the provision in association with the stop z' of a thread which engages with a. n'ut c, the stop 1s rendered accurately adjustable inthe aXi'al direction so that it may beset to become operative at or shortly before the instant, depending on the length of the Work, at which the return movement of the tool is to commence.

p in which the work in the form of rods or4 bars is secured. lVhen, with the mcthod of terminating the movement described, the stop has made contact, the articles-being worked rotate a certain amount further while the tools, since the slide is retained by the stop,

do not .progress further. In order that the movement may terminate ,quietly without breakage of the gear or damage to the tools or the work, the sleeve I) on the spindle is not rigidlysecured to the tool slide c, one or more compression springs being introduced in compression between the two said members.. 0n the termination of the movement the spindle a tends to move the sleeve mounted thereon, in the axial direction, the springs g thus being compressed. The sleeve is in consequence moved into the stationary slide c to the extent required by the termination of the movement. The occurence of excessive forces and the possibility of breakage are obviated in this manner.

As in the case ofthe axially movably maln l tool-slide, the transmission of the pressure on tool to exactly central.

the transverse slides movable perpendicularly to the longitudinal axis is arranged to be spindle a drives, through the pinions r, exchangeable gears s, shaft t and driver u Fig. 2), a ring lv which is mounted on the casing of the head-stock so as to be capable of rotation about the axis of the threaded spindle. Guide bars m, each oscillable about a pivot y, are arranged in the ring lv, the ends of the bars being adjustable to diierentrdegrees of eccentricity relative to the .Lxis of the ring fv, by means of adjusting screws a. ly movable lateral slides 2 are thus moved radially withrelation to the ring -v by these bars a', a roller 3 mounted on each lateral slide'engaging in a groove inthe guide bar. -As the driving ring v rotates backwards and forwards the lateral slides 2 are moved radially backwards and forwards. Two lateral slides only are illustrated in the drawings but a larger number of lateral slides may be disposed uniformly radially around the ring. Each of the guide-rollers 3 is mounted on a sliding'member 5 adjustable in the lateral slide b he exactly adjusted. The amplitude of movementof the' lateral slide may. be adjusted atwill by swinging the guide bar a: by means of the adjusting screw z.

A projection 6, on the circumference. of the ring 'v actuating the lateral slides contacts towards the end ofthe angular movement thereof With the lever 7 and thereby, through the To this end the threadedk Thetransversemeans of a screw 4, this enabling theintermediary of the shaft 8, bevel wheels 9v `and shaft 10, moves the clutch d of the change speed gear so that the rapid return movenient replaces the slow forwardmovement. Shortly before the machine is automatically changed over to the rapid return movement in this manner the central stop surfaces h, i for the main tool-slide come into contact with each other, as described above, so that at the end of each operation the work may come to rest before the rapid return movementcommenccs. Towards the end of the latter movement the projection 6 effects the gear change back to operative movement. By employing' gear-wheels of different gear ratio in the gear s the longitudinal movementof the main slide c may be adapted to the particular length to be turned or bored without variation otthre -angular rot ationof the driving ring fv or of the the present invention it is very important .f i

that the automatically-fed bars or rods of material should be so mounted and guided that in spite of the high turning speed they do not deform under the centrifugal force, cause no noise and are, nevertheless readily replaceable. Means for guiding'the 'material so as to achieve the ends stated are illustratedby way of example in Figs.'4 and 5 in association -with a turret-lathe wherein six rods 1,/ l, distributed uniformly around the circle are passed through the turret like rotary disc 13. The rod l, when of comparatively large diameter (upper part of Fig. 4) is gripped at definite intervals by three-jaw chucks 11 of which theja'ws are radially adjustable and securable in .such a manner that the' rod although exactly centered is able to move in the longitudinal direction relativelyv to the chuck 11. 'The three-jaw chucks are mounted in the rotary disc 13 in ball-bearings 12 so as to be easily rotatable. vDeformation three-jaw chuck 11, whichis readily rotatable in the ball bearing, grips a tube 14 in which the rod Z, is disposed with a slight amount of play. On the rapid rotation of the rod the tube is entrained by the friction, that i's it takes part centrifugal force and minimizes noise. On account of the arrangement of the three-jaw chuck the tube 14 1s readily exchangeable so in the rotation, prevents deformation under rdiameters can always be set' up.

In both of the arrangements described the ever may bethe angular position of themal forward in the corresponding grooves of the angle of 15.

body 31. The turning of the coll'ar 1,5 is machines is the same in each case. At theA turned until they press closeup against the .a maximum, to the axis of the transmission that the appropriate tubes for rods of various may in this manner always be adjusted to be parallel to'the transmission shafting whatnoise hitherto caused by known rod-guides is chine -relatively to said shafting (Fig. 6). If obviated. the pulley is swung parallel to the, shafting In order to center the rod of material or the and is' secured in this position the belt will guide-tube 14 exactly in the chuck, the ringrunzon'the pulley without any twisting so that nut 30 which secures the collar 15 against rothe deficiencies mentioned abve will not arise. tation is linscrewed until it is brought slightly Itis clear from Fig. 6 that it is also possible outside of the body 31 which rests upon the in this way to economize considerably in space ball bearings 12. In this way the collar 15, and to utilize substantially shorter lengths of 'which is provided with a face thread 16, is set transmission shafting. For example four A free and can be rotated. B means of this n'lachines arranged according to the present turning of the collar 15, wiich rests on' a invention at an ang-leef inclination of 45 'shoulder 33 of the body 31, the jaws 11 which lnay be accommodated'on approxmately'the are provided with projecting teeth in mesh same length 25 of sh'afting` as Was' hitherto" with the face-winding thread 16 are moved necessary for two machines arranged at an The distance 26 between the continued 'until the jaws 11 have come up same time the full belt eiiiciency is achieved against the rod of material 1 in such manner since all-the belts run straight on to the pulthat the latter can glide exactly centrally beleys. There is no objection to the machines tween the jaws. By the 'use of a guide tube being arranged at an even greater angle to 14 it becomes practicable for the aws-11 to be the shafting than that illustrated.

Moreover, with this method of driving the stationary tube 14 and thus center the latter. machines, the pumps 27 for the cooling liquid Then the previously released ring-nut 30 is may be mounted on a downward extension of again screwed into the body j ring nut 30 presses close against'the collar 15 thereby. Intermediate members, such as belt and secures it against rotation. In this manor chain gear, are then unnecessary. 'The ner radial shifting of the jaws 11 due to vibrapump is not disturbed by the swinging of the tion of the rods is obviated. pulley 19 and,` consequently, the suction and Such turret lathes for working material the pressure pipes mounted rigidly on the main rod form were hitherto, when drivenffrom chine need not be displaced. a common transmission shaft, usually ar- Having now particularly described and asranged in the manner indicated with dotted certained thenature of my said invention and lines in Fig. 6. The central axes 17 of the in what manner the same is to be performed,

lathes were inclined at a slight angle, 15 asV I declare that what I claim is 1. In a multiple-spindle turret-lathe, the shafting. The work operated on by one lathe combination of a work holder mounted to rewas thus disposed behind and to one side of volve on its axis and held from longitudinal the neighbouring machine. It was not p osmovement, -anaxially movable main tool slide, sible materially to exceed 15 because the a plurality of work spindles mounted for rotwisting of the belt running on the lathe-pultation on their respective axes in said holder,

ley 19 would have been too great and the arc Aa shaft passing centrally through said tooll over 'whih the belt contacted withthe pulley slide for driving said work spindles, a too smal one sided stretching of the belt whereby efficiency is lost since thebelt, after stretching, no longer bears on the whole of the pulley.

These disadvantages are overcome by the arrangement illustrated in Figs. 6-8.

rl`he driving pulley 19 of the machine is by the tool slide shaft and work of any length adapted to swing about a-vertical shaft 2() and whatever may be operated on without interdrives the Platter through bevels 21. The ference with the turret head gearing. shaft 20 inturn transmits the drive through 2. In a multiple-spindle turret-lathe, the bevels 22 to the horizontal shaft 23 and thus combination ofa Work holder mounted to respindle shaft in coaxial relation thereto, and means between said tubular shaft-and tool slide for imparting axial movement to said to the machine. A casing 24 enclosing the volve -on its axis and held from longitudinal vertical shaft 2O and the driving pulley 19, movem ent, an axially movable main tool slide, the latter being journalled therein, is also a plurality of work spindles mounted for roadapted to be swung about the said shaft 20. tation on their respective axes in said holder, The pulley the vertical interrupted, the bevels 21 rolling on vone anshaft disposed about said work spindle shaft other during any such swinging. The pulley in coaxial relation thereto, means between 31 so that the the vertical shaft 20 to be driven directly Furthermore twisting results in tubular shaft disposed about said Workl 115 slide, the organization being such that the cutting pressure of all of the tools is absorbed 19 may therefore be swung about ashaft passing centrally through said tooll shaft 20 without the drive being slide for driving said work spindles, a tubular Asair. tubular 'shaft and-tool slide for imparting axial movement to said slide, a stop in the path of movement of the slide for limiting said axial movement, and resilient means between said slide, and its moving'means for vpermitting continued movement of the lat-tei' 'to a predeterminedextent afterthe stoppage of the slide. Y 3. In a multiple-spindle turret-lathe, the combination of a .woi-k holder mounted torevolve on its axis and held from longitudinal movement, a plurality of lateral tool'slides disposed adjacent to said holder, a rotatable ringcoaxial with said work holder, guide members carried by said ring in engagement with said slides for controlling the movement thereof, each of said guide members being pivoted at one end thereof to said ring, and

means for changing the direction of move- ,ment of the slide, a plurality of lateral tool slides, means for actuating the same, and means ycarried by said lateral-slide-actuating means for operating said direction-changing means.

5. In a multi ple-spindle turret-lathe, driving means comprising shafts for transmitting motion to said machine, and a driving p lley mounted for swinging movement about verc tical axis for adjusting said pulley into parallel relation to said shafts.

6. Iii a niultiplelspindle turret-lathe, driving means coinprisin 4shafts for transmitting motion to said mac une, a driving pulley mounted for swinging movement about a vertical axis for adjusting said pulley into parallel relation to said shafts, and means for supplying a cooling liquid to the bearings of the machine. i

In testimony whereof I have signed my naine to this specification.

FRITZ POPPENSIEKER. 

